package cn.itcast;

public class Var1 {
    public static void main(String[] args) {
        int i = 30;
        Integer n = 20;//自动装箱
        Integer nn = Integer.valueOf("30");
        System.out.println(n.intValue());
//拆箱操作
        int t = nn;
        int t2 = nn.intValue();
    }

}
